PUTCTL1(9F) Kernel Functions for Drivers PUTCTL1(9F)

NAME

putctl1 - send a control message with a one-byte parameter to a queue

SYNOPSIS

#include <sys/stream.h>


int putctl1(queue_t *q, int type, int p);

INTERFACE LEVEL

Architecture independent level 1 (DDI/DKI).

PARAMETERS

q
Queue to which the message is to be sent.


type
Type of message.


p
One-byte parameter.

DESCRIPTION

The putctl1() function, like putctl(9F), tests the type argument to make
sure a data type has not been specified, and attempts to allocate a
message block. The p parameter can be used, for example, to specify how
long the delay will be when an M_DELAY message is being sent. putctl1()
fails if type is M_DATA, M_PROTO, or M_PCPROTO, or if a message block
cannot be allocated. If successful, putctl1() calls the put(9E) routine
of the queue pointed to by q with the newly allocated and initialized
message.

RETURN VALUES

On success, 1 is returned. 0 is returned if type is a data type, or if a
message block cannot be allocated.

CONTEXT

The putctl1() function can be called from user, interrupt, or kernel
context.

EXAMPLES

See the putctl(9F) function page for an example of putctl1().

SEE ALSO

put(9E), allocb(9F), datamsg(9F), putctl(9F), putnextctl1(9F)


Writing Device Drivers


STREAMS Programming Guide


January 16, 2006 PUTCTL1(9F)